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The new implementation supports both rotating by fixed angles of +90 degree
(used for remote controls) and rotating by an arbitrary angle which makes
rotating with touch gestures much more intuitive. Nothing changes for zooming
by fixed angles. For rotating by an arbitrary factor every rotation must start
by sending the ACTION_GESTURE_BEGIN action and end by sending the
ACTION_GESTURE_END action. In between the ACTION_GESTURE_ROTATE can be sent
containing an arbitrary floating-point angle (in degrees) to perform rotation
actions.